Thermodynamics of two, two-dimensional phases formed by CO/sub 2/ chemisorption on MgO
Journal Article
·
· J. Phys. Chem.; (United States)
Variations in concentrations of CO/sub 2/ adsorbed on MgO with temperature at constant pressure and with pressure at constant temperature at 880 to 950 K indicate a miscibility gap. In the low coverage region the enthalpy of chemisorption is -207 +/- 2 kJ/mol of CO/sub 2/ and the entropy of adsorption is -183 +/- 10 J/(mol deg). The molar enthalpy and entropy transition from the low to high coverage phase are -9 +/- 5 kJ and -13 +/- 10 J/deg. The enthalpies and entropies of adsorption show that the CO/sub 2/ is much more strongly held as CO/sub 3//sup 2 -/ ions on the MgO surface than in MgCO/sub 3/. The number of Mg/sup 2 +/ ions bound to each surface CO/sub 3//sup 2 -/ ion on MgO at 600 to 1000 K must be higher than reported from infrared measurements of CO/sub 2/ adsorbed as CO/sub 3//sup 2 -/ on MgO near room temperature.
- Research Organization:
- Lawrence Berkeley Lab., CA
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6036892
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:13; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
DATA
ENTHALPY
ENTROPY
EXPERIMENTAL DATA
HIGH TEMPERATURE
INFORMATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
400201* -- Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
DATA
ENTHALPY
ENTROPY
EXPERIMENTAL DATA
HIGH TEMPERATURE
INFORMATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
THERMODYNAMICS